Taking 4 step and 8 step and 16 step Fresnel lens for example, the effect of alignment error on diffractive efficiency is analyzed systematically and simulated by computer.

并以4台阶、8台阶、16台阶菲涅耳透镜为例，系统分析对准误差对衍射效率的影响并进行计算机模拟研究。

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The results of computer simulation can provide theoretical basis for the fabrication of 16-step Fresnel lens.

模拟计算结果对正在进行的16台阶菲涅耳透镜制作工作提供了理论指导。

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The thin film deposition is used to make 16 step Fresnel lens . It can implement system′s lightweight, miniaturization and increase free degree of the design.

使用薄膜沉积法制作16阶菲涅耳透镜，用它代替常规的光学透镜可实现系统的轻量化、小型化，并增加系统设计的自由度。

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Despite the reduced 5x 28-140mm lens, this flavor is a bit heftier, though it's a step up from most other A-series Canons.

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